Abstract
Female heterogamety (WZ type) has been demonstrated in the terrestrial isopods Oniscus asellus (Oniscidae) and Eluma purpurascens (Armadillidiidae), by making crosses between two genetic females (one of them experimentally reversed into a functional neo-male). The WW individuals generated by such crosses were viable and fertile females. These data, plus the frequent monomorphism of sex chromosomes and the coexistance of two heterogamety types (XX/XY and WZ/ZZ), indicate that sex chromosome differentiation in isopods is at a primitive stage. The evolution of sex chromosomes in this group of crustaceans is discussed, and it is suggested that this evolution has been disturbed by parasitic sex factors.
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Juchault, P., Rigaud, T. Evidence for female heterogamety in two terrestrial crustaceans and the problem of sex chromosome evolution in isopods. Heredity 75, 466–471 (1995). https://doi.org/10.1038/hdy.1995.163
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DOI: https://doi.org/10.1038/hdy.1995.163
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